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A fart that is one single loud explosion. A very loud and if not controlled properly, could hurt the shooter.
Damn Lenny, did you hear that butt rifle?
by Nick Weismiller September 12, 2005
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When all your friends catch you Scoping other guys asses all the time. Very shameful, but it does happen.
Guy#1: "Hey, stop checking out guys`s asses"

Guy#2: "Im not, I was..."

Guy#1: "Yeah whatever, butt rifle"
by Swayy April 23, 2010
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